Chemical shield pump repair method is: Disassemble the shield pump: the first part of the clean-up, and then make an apparent inspection of them, whether there is any exception. Then measure the size of the key parts, electrical inspection of the motor windings
(1) Mechanical inspection Measure the bore diameter of graphite bearings and the shaft diameter of bushings and check the finish of their mating surfaces. Such as graphite bearings and bushings with clearance over the provisions of maintenance standards (0.55-11kw with the gap, the diameter difference of 0.4 mm, 15-45kw with the gap, the diameter difference of 0.5 mm) or with poor surface finish, the chemical shield pump Depending on the situation, replace the bearing, sleeve or thrust plate. Chemical screening pump inspection Check the impeller's upper and lower outer stop and their matching buckle and the size of the inner diameter of the pump seat, the two with the gap is within the scope of the overhaul standards, the need to replace the excess or take parts Other measures (such as surfacing, insert sets) to meet the requirements of the gap. Otherwise it will affect the pump performance, flow, lift, axial balance and so on. Chemical shield pump inspection set inspection, the apparent appearance of the rotor shield sleeve, with particular attention to whether there is any abnormal weld, if necessary, should be for testing, leak check. After long-term operation, the balance of rotating parts may change. Therefore, it is necessary to rotate the rotor together with the impeller and other rotating parts assembled to do dynamic balancing test
(2) Electrical Check DC Resistance Check: Three-phase resistance unbalance shall not exceed 2%. Chemical shield pump insulation resistance check: shield pump motor winding insulation resistance can generally reach more than 100MΩ. Such as less than 5MΩ need to analyze the reasons for insulation is damp, or shielding the leak if there is no problem, such as leakage through the stator shield no problem, then purely moisture insulation, the need for drying treatment, such as stator shield has a problem, You need to change the shielding sleeve.
There are several chemical masking pump damage the following conditions:
(1) graphite bearings, bushings and thrust plate wear or lack of lubrication dry wear and damage.
(2) chemical shielding pump set, the rotor shield damage caused by damage to the shield, the main bearing damage or wear exceeds the limit caused by the stator and rotor shield sleeve rubbed and damaged; secondly due to chemical corrosion caused by weld and other places produced leakage.
(3) Stator winding damage In addition to the ordinary motor is the same: overload, inter-turn short circuit, on the ground breakdown caused by the stator winding damage reasons, there are also damaged due to the stator shield damage caused by erosion of the motor winding dielectric winding insulation. Periodic Inspection of Chemical Shield Pumps In order to avoid and reduce the sudden damage of the shield pump, the shield pump needs regular maintenance. Chemical shield pump in case of bearing monitor "alarm", must be immediately overhaul. Chemical plant is generally continuous operation, shielding pump regular maintenance only when the device is scheduled to stop. Most shield pumps can be serviced once a year. Chemical shield pump repair method is: Disassemble the shield pump: the first part of the clean-up, and then make an apparent inspection of them, whether there is any exception. Then measure the size of the key parts, electrical inspection of the motor windings.
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